Errata for the Physics 120 Course Materials

PROBLEM SET 3:

Problem 4:

I apologize, but there is does not seem to be a simple method of images
solution to part (d).  So, go directly to part (e).  By modifying the
potential obtained in class for a conducting sphere in a fixed background
E field, you should be able to find a solution to Laplace's equation
that describes this situation.

PROBLEM SET 3/4:

Java Applet:

To facilitate the numerical part of Problem Set 4, problem 5, I have 
put a new version of the Laplace applet on the web site.  This version 
draws a grid on the screen to make it easier to measure distances.  I 
realize that this is not exactly a precision drafting device, but do the
best you can.  In the new version of the applet, the electrostatic potential
phi is called "phi[i][j]", not "A[i][j]" as in the previous version.

PROBLEM SET 4:

Problems 3 and 4:

For both problems 3.48 (a) and (b) of Griffiths, the answer is

  lambda = - epsilon_0 V_0 ln 2 / pi

In each case, the result appears as the sum of a series.  You can check
it numerically.